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High-performance lithium iron phosphate cathode material and preparation method of lithium iron phosphate cathode material

A technology for lithium iron phosphate and cathode materials, applied in chemical instruments and methods, phosphorus compounds, battery electrodes, etc., can solve problems such as poor repeatability, complicated operation, and impact on material tap density, and achieve cost reduction and uniform particle distribution , the effect of excellent electrochemical performance

Active Publication Date: 2013-05-29
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention uses carbon coating to modify lithium iron phosphate. Although the electrical conductivity is improved, the tap density of the material is affected, and the method of spray drying is complicated and the repeatability is poor.

Method used

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  • High-performance lithium iron phosphate cathode material and preparation method of lithium iron phosphate cathode material
  • High-performance lithium iron phosphate cathode material and preparation method of lithium iron phosphate cathode material
  • High-performance lithium iron phosphate cathode material and preparation method of lithium iron phosphate cathode material

Examples

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Embodiment 1

[0059] (1) Add 7.5g TiO 2 Mixed with 400mL of 5M NaOH solution, ultrasonically mixed for 3h, transferred to a 500mL hydrothermal kettle, and placed in an oven at 200°C for 40h of hydrothermal reaction. After the reaction, take out the reaction kettle, after natural cooling, filter to obtain the product, fully wash with 0.3M dilute sulfuric acid and keep stirring until the pH reaches neutral, then wash with deionized water and absolute ethanol several times after suction filtration, After drying at 100°C, titanic acid nanowires were obtained. Put titanate nanowires in a crucible, keep it warm at 600°C for 3 hours, and cool it down to room temperature naturally to get TiO 2 Nanowires.

[0060] (2) Weigh 3.6g V 2 o 5 Put it in a beaker, add 30mL of n-hexanol and 70mL of deionized water, stir magnetically for 1h, transfer the orange suspension to the reaction kettle, and keep it at 200°C for 60 hours. After the reaction, take out the reaction kettle, cool naturally, and filter...

Embodiment 2

[0065] TiO 2 nanowire with V 3 o 7 The synthesis of nanowires is the same as in Example 1.

[0066] Weigh 7.3g of lithium hydroxide and 34.1g of iron phosphate, dissolve LiOH in deionized water, add iron phosphate to the above solution after it is completely dissolved, and obtain a homogeneous solution by ultrasonication, add 20g of citric acid into the above solution, and then add 0.133g V 3 o 7 , add deionized water to make the volume to 350mL, transfer to a 500mL reactor, and keep the temperature at 150°C for 10 hours. After the reactor was cooled to room temperature, the product was washed several times with deionized water, centrifuged and analyzed, and the precipitate was dried at 100° C. for 10 h to obtain a green lithium iron phosphate precursor. Weigh the green precursor, mix it with citric acid with a mass ratio of carbon: precursor = 0.07:1, ball mill it at a speed of 300rmp for 1 hour, transfer it to a crucible, and heat it at 5°C under the protection of a nit...

Embodiment 3

[0069] TiO 2 nanowire with V 3 o 7 The synthesis of nanowires is the same as in Example 1.

[0070] Weigh 7.3g of lithium hydroxide and 34.1g of iron phosphate, dissolve LiOH in deionized water, add iron phosphate to the above solution after it is completely dissolved, and obtain a homogeneous solution by ultrasonication, weigh 16.1g of ascorbic acid and 33.7g of ammonium bicarbonate and add In the above solution, then add 0.157g TiO 2 with 0.133g V 3 o 7 , add deionized water to make the volume to 350mL, transfer to a 500mL reactor, and keep the temperature at 180°C for 10 hours. After the reactor was cooled to room temperature, the product was washed several times with deionized water, centrifuged and analyzed, and the precipitate was dried at 100° C. for 10 h to obtain a green lithium iron phosphate precursor. Weigh the green precursor, mix it with glucose with a mass ratio of carbon: precursor = 0.05:1, ball mill at 300rmp for 1 hour, transfer to a crucible, and unde...

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Abstract

The invention relates to a cathode material lithium iron phosphate for a lithium ion cell and a preparation method of lithium iron phosphate. The preparation method comprises the following steps: synthesizing a lithium iron phosphate cathode material through a hydrothermal method by taking a ferric iron salt as an iron source and a nanocrystalline metal oxide as a doped source, subsequently mixing lithium iron phosphate with organic acid or sugars, and sintering at high temperature to obtain the high-performance lithium iron phosphate cathode material coated by carbon. According to the preparation method disclosed by the invention, the ferric iron salt with low price is used as the raw material, so that the cost is saved; and the nanoscale metal oxide is used as the doping element, so that a crystal nucleus is provided for hydrothermal crystallization and the implementation of the reaction is accelerated.

Description

technical field [0001] The invention relates to the field of electrode material preparation, in particular, the invention relates to a high-performance lithium iron phosphate cathode material and a preparation method thereof. Background technique [0002] A lithium-ion battery is a rechargeable battery that primarily relies on the movement of lithium ions between the positive and negative electrodes to function. During the charging and discharging process, Li + Intercalation and deintercalation back and forth between two electrodes: when charging the battery, Li + It is deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. Generally, batteries containing lithium elements are used as electrodes. Lithium-ion batteries are the representative of modern high-performance batteries. As a new type of energy storage device, lithium-ion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58C01B25/45
CPCY02E60/12Y02E60/10
Inventor 谭强强吕诚吕霄徐宇兴
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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